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1. Hot stars are easily visible in the night sky, but cool stars, which are much more com- mon, are much fainter. For example, the star nearest the Sun has a surface temperature of "only" 3000 K, and we cannot see it without a telescope. At what wavelength of light is this nearest star brightest? (A) 0.1 um (B) 0.5 um (C) 1 um (D) 5 um (E) 10 um Show how you got your answer. 2 2. At The this star time is question 1 belongs to a system of three stars that orbit around each 78,000 the star in question 1 is moving toward Earth in its orbit at a other. whose true km/h. wavelength What is the is 656.28520 observed nm? wavelength of the star's red spectral line of hydrogen, speed of (A) 656.1902 nm (B) 656.2378 nm (C) 656.2850 nm (D) 656.3327 nm (E) 656.3800 nm Show how you got your answer.

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